/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package pe.gob.pnp.digitalizar.servlets;


import java.awt.*;
import java.awt.image.*;
import java.io.*;
import java.sql.*;
import javax.imageio.*;
import javax.servlet.*;
import javax.servlet.http.*;
import pe.gob.pnp.factories.*;

/**
 *
 * @author Eduardo
 */
public class VistaPreviaFolioConsulta extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {


        response.setDateHeader("Expires", 0);
        response.setContentType("image/jpeg");
        OutputStream out = response.getOutputStream();

        try {
            int id = Integer.parseInt(request.getParameter("id"));
            byte[] data = obtenerImagenFolio(id);
            ByteArrayInputStream bis = new ByteArrayInputStream(data);
            BufferedImage imagen = ImageIO.read(bis);
            bis.close();

            int ancho = 800;
            int alto = 850;
            BufferedImage img = new BufferedImage(ancho, alto,BufferedImage.TYPE_INT_RGB);
            Graphics2D g = img.createGraphics();
            g.drawImage(imagen, 0, 0, ancho, alto, null);
            g.dispose();
            ImageIO.write(img, "jpg", out);
        } finally {
            out.close();
        }
    }

    public byte[] obtenerImagenFolio(int id) throws IOException {
        byte[] data = null;
        Connection conn = null;
        String sql = null;
        try {
            conn = ConnectionPool.obtenerConexion();
            sql = "SELECT BFOLI_IMAGEN";
            sql += " FROM DIGMA_FOLIO";
            sql += " WHERE NFOLI_IDENTIFICADOR=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setInt(1, id);
            ResultSet rs = ps.executeQuery();
            if (rs.next()) {
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                InputStream is = rs.getBinaryStream("BFOLI_IMAGEN");
                byte[] buf = new byte[2048];
                int b;
                while ((b=is.read(buf)) != -1){
                    out.write(buf);
                }
                data = out.toByteArray();
            }
        } catch (SQLException ex) {
            throw new IOException(ex);
        } finally {
            ConnectionPool.liberarConexion(conn);
        }
        return data;
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
